XSLT question on transitive closures

Am I right in thinking that 

1) XPath2 functions don't have have a function for transitive closure
(along provided xpaths)

2) SAXON 8 does not have the saxon:closure() extension function that
older versions of SAXON had

3) The one to use is probably still Christian Nentwich's code from circa
2001 as adopted into EXSLT ?


Cheers
Rick